Abstract. Global magnetohydrodynamic stability limits in the National Spherical Torus Experiment (NSTX) have increased significantly recently due to a combination of device and operational improvements. First, more routine H-mode operation with broadened pressure profiles allows access to higher normalized beta and lower internal inductance. Second, the correction of a poloidal field coil induced error-field has largely eliminated locked tearing modes during normal operation and increased the maximum achievable beta. As a result of these improvements, peak beta values have reached (not simultaneously) beta-t = 35%, beta-N = 6.5, volume-average beta-N = 4.5, beta-N / li = 10, and beta-P = 1.4. High beta-P operation with reduced tearing activity has allowed a doubling of discharge pulse-length to just over 1 second with sustained periods of beta-N = 6. Details of the beta limit scalings and beta-limiting instabilities in various operating regimes are described.